Analog Test Circuit Isolation During Power-Up Switching
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Solution Overview
Problem
Existing test circuits for analog circuits in electronic devices face malfunctions during power-up due to uncertain switching states of controllers, leading to potential electrical shorts or failures in testing operations.
Innovation Solution
A test circuit with a control signal generator and a switching circuit that maintains an electrically open state during power-up, using distinct power sources for the control circuit and switching circuit to prevent connections between analog circuits and ensure stable testing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control circuit is connected to analog circuits during power-up, then testing operations can be performed, but electrical shorts or malfunctions may occur due to uncertain switching states
Solution Approach 1:
The switching circuit is configured to maintain an open state during the power-up period before the control circuit is fully powered. This preliminary action prevents potential electrical shorts by ensuring that connections to analog circuits are established only after the control circuit is ready, eliminating the harmful effect of uncertain switching states during initialization.
2Productivity
If the switching circuit remains closed during power-up, then connections are established quickly, but malfunctioning may occur due to uncertain controller states
Solution Approach 1:
The switching circuit proactively maintains an open state during the power-up period to counteract the potential harmful effects of uncertain controller states. This preliminary anti-action prevents malfunctions by blocking connections until the control circuit is fully powered and ready, ensuring reliable testing operations without sacrificing long-term connection efficiency.
3Reliability
If distinct power sources are used for control circuit and switching circuit, then power-up malfunctions are prevented, but device complexity increases
Solution Approach 1:
The power supply system is segmented into distinct power sources: one for the control circuit and another for the switching circuit. This segmentation allows independent power-up sequencing, enabling the switching circuit to remain open during control circuit initialization. The added complexity is minimal and localized to the power distribution network, while reliability during power-up is significantly improved.
Data Source
AI summary
Provided herein may be a test circuit of an electronic device, the electronic device including the test circuit, and an operating method thereof. The electronic device may include analog circuits, a control circuit configured to connect, to an output terminal, each of a plurality of nodes respectively included in the analog circuits to an output terminal, a control signal generator configured to generate a control signal for controlling the control circuit based on an input signal received from an external device, and a switching circuit disposed on an electrical path for connecting the plurality of nodes and the control circuit to each other and configured to be electrically open during a preset time amount from a time point at which a voltage from an external power source starts to be applied to the control circuit.